Hacked? How can I tell what process is sending packets from a particular port (udp/55613)?

[Frank Steinborn]

boink wrote:
> Dear FreeBSD,
> 
> I see outbound packets from udp/55613, one every 5 seconds, to a
> single non-routable (10....) IP, with destination port increasing by 1
> with each packet, with expected ICMP Destination net unreachables from
> an upstream router.
> 
> AFAIK, there's no reason for this and I don't like it - how can I tell
> which process is sending the packets?
> 
> With thanks in advance,
> boink

Try to catch the process with "sockstat -46p 55613"

HTH,
Frank